Field emitter

Abstract

Disclosed is a field emitter, including: a cathode electrode in a shape of a tip; an emitter having a diameter smaller than a diameter of the cathode electrode and formed on the cathode electrode; and a gate electrode having a single hole and located above the emitter while maintaining a predetermined distance from the emitter.

What is claimed is: 
     
       1. A field emitter, comprising:
 a cathode electrode in a shape of a tip; 
 an emitter having a diameter smaller than a diameter of the cathode electrode, having a shape of a plate, and formed on the cathode electrode; and 
 a gate electrode having a single hole and located above the emitter while maintaining a predetermined distance from the emitter. 
 
     
     
       2. The field emitter of  claim 1 , wherein the diameter of the emitter is varied according to the diameter of the cathode electrode, a diameter of the hole of the gate electrode, and a distance between the cathode electrode and the gate electrode. 
     
     
       3. The field emitter of  claim 1 , wherein the diameter of the emitter is smaller than the diameter of the cathode electrode, and a minimum diameter of the emitter is determined according to an area for withdrawing a desired current. 
     
     
       4. The field emitter of  claim 1 , wherein the diameter of the hole of the gate electrode is larger than the diameter of the emitter and smaller than 10 times of the diameter of the cathode electrode. 
     
     
       5. The field emitter of  claim 1 , wherein a distance between the cathode electrode and the gate electrode is larger than 0 and smaller than 10 times of the diameter of the cathode electrode.